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Estimation of Evapotranspiration from Toa Radiances in the Poyang Lake Basin, China : Volume 9, Issue 9 (27/09/2012)

By Peng, J.

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Book Id: WPLBN0004013107
Format Type: PDF Article :
File Size: Pages 41
Reproduction Date: 2015

Title: Estimation of Evapotranspiration from Toa Radiances in the Poyang Lake Basin, China : Volume 9, Issue 9 (27/09/2012)  
Author: Peng, J.
Volume: Vol. 9, Issue 9
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description
Description: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China. Routine and rapid estimation of ET (evapotranspiration) at regional scale is of great significance for agricultural, hydrological and climatic studies. A simplified single-source energy balance parameterization scheme, known as the LST/NDVI (Land Surface Temperature/Vegetation Index) triangle method, has been applied successfully to estimate regional clear sky ET in many studies. Based on the triangle method, we proposed a new method in this study to estimate daily ET directly using the TOA (Top of Atmosphere) radiances without performing atmospheric correction and other complicated processes. Firstly, the EF (Evaporative Fraction, defined as the ratio of latent heat flux to surface available energy) was estimated by interpolation in the LST/NDVI triangular-shaped scatter space, which was constructed using the MODIS (Moderate Resolution Imaging Spectro radiometer) TOA radiances over a heterogeneous area of the Poyang Lake Basin in China. Then the net radiation over the same study area was derived based entirely on MODIS TOA radiances as well. Finally, daily ET maps were estimated from these EF maps and net radiation maps by using a sinusoidal temporal interpolation model. The estimated EF, net radiation and ET have been validated against field observations collected for the period October 2007–July 2008. The results indicate comparable accuracy to results of other current widely used satellite-based methods. In addition, intercomparisons between the proposed method-based estimates and MODIS products-based estimates were also carried out over the validation site. The results suggest that the proposed method performed slightly better than the MODIS products-based triangle method. Overall, the proposed algorithm requires fewer assumptions and can avoid uncertainties associated with the satellite derived products, while its accuracy is slightly higher. It should facilitate direct use of satellite data for determining ET and relevant applications as well. Nonetheless, more validation work needs to be carried out with more integration of satellite data and ground-based measurements over various climatic regions and under different surface conditions in the future.

Summary
Estimation of evapotranspiration from TOA radiances in the Poyang Lake Basin, China

Excerpt
Batra, N., Islam, S., Venturini, V., Bisht, G., and Jiang, L.: Estimation and comparison of evapotranspiration from MODIS and AVHRR sensors for clear sky days over the Southern Great Plains, Remote Sens. Environ., 103, 1–15, 2006.; Bhattacharya, B. K., Mallick, K., Patel, N. K., and Parihar, J. S.: Regional clear sky evapotranspiration over agricultural land using remote sensing data from Indian geostationary meteorological satellite, J. Hydrol., 387, 65–80, 2010.; Bisht, G. and Bras, R. L.: Estimation of net radiation from the MODIS data under all sky conditions: Southern Great Plains case study, Remote Sens. Environ., 114, 1522–1534, 2010.; Bisht, G., Venturini, V., Islam, S., and Jiang, L.: Estimation of the net radiation using MODIS (Moderate Resolution Imaging Spectroradiometer) data for clear sky days, Remote Sens. Environ., 97, 52–67, 2005.; Caparrini, F., Castelli, F., and Entekhabi, D.: Estimation of surface turbulent fluxes through assimilation of radiometric surface temperature sequences, J. Hydrometeorol., 5, 145–159, 2004.; Glenn, E., Nagler, P., and Huete, A.: Vegetation Index methods for estimating evapotranspiration by remote sensing, Surv. Geophys., 31, 531–555, 2010.; Carlson, T. N.: An overview of the triangle method for estimating surface evapotranspiration and soil moisture from satellite imagery, Sensors, 7, 1612–1629, 2007.; Carlson, T. N., Gillies, R. R., and Schmugge, T. J.: An interpretation of methodologies for indirect measurement of soil water content, Agr. Forest Meteorol., 77, 191–205, 1995.; Cleugh, H. A., Leuning, R., Mu, Q., and Running, S. W.: Regional evaporation estimates from flux tower and MODIS satellite data, Remote Sens. Environ., 106, 285–304, 2007.; Crago, R. D.: Conservation and variability of the evaporative fraction during the daytime, J. Hydrol., 180, 173–194, 1996.; Davies, J. A. and Allen, C. D.: Equilibrium, potential and actual evaporation from cropped surfaces in Southern Ontario, J. Appl. Meteorol., 12, 649–657, 1973.; Eichinger, W. E., Parlange, M. B., and Stricker, H.: On the concept of equilibrium evaporation and the value of the Priestley–Taylor coefficient, Water Resour. Res., 32, 161–164, 1996.; Farah, H., Bastiaanssen, W., and Feddes, R.: Evaluation of the temporal variability of the evaporative fraction in a tropical watershed, Int. J. Appl. Earth Obs., 5, 129–140, 2004.; Farahani, H. J., Howell, T. A., Shuttleworth, W. J., and Bausch, W. C.: Evapotranspiration: progress in measurement and modeling in agriculture, T. Asabe, 50, 1627–1638, 2007.; Frey, R. A., Ackerman, S. A., Liu, Y., Strabala, K. I., Zhang, H., Key, J. R., and Wang, X.: Cloud detection with MODIS. Part I: Improvements in the MODIS cloud mask for collection 5, J. Atmos. Ocean. Tech., 25, 1057–1072, 2008.; Galleguillos, M., Jacob, F., Prévot, L., French, A., and Lagacherie, P.: Comparison of two temperature differencing methods to estimate daily evapotranspiration over a Mediterranean vineyard watershed from ASTER data, Remote Sens. Environ., 115, 1326–1340, 2011.; Garatuza-Payan, J., Pinker, R. T., Shuttleworth, W. J., and Watts, C. J.: Solar radiation and evapotranspiration in Northern Mexico estimated from remotely sensed measurements of

 

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